Axillary (Underarm) Temperature

An axillary temperature is taken by holding the thermometer under your baby's arm. To give a correct reading, this must be done with care. Axillary temperatures are a good screening but may be inaccurate at times. Use the steps on this handout as a guide.

Getting the thermometer ready

Be sure to use a thermometer that is for underarm use.

Clean the thermometer before and after each use.

Be sure the thermometer is at room temperature.

Remove the cover from the thermometer.

Positioning your baby

Hold your baby on your lap. Or lay your infant on his or her back on a firm surface.

Read the temperature on the digital display. Normal temperature is around 98.6°F (37°C), but it can range from 97.6°F to 99.6°F (36.4°C to 37.6°C). Axillary temperatures can range from 0.5°F to 1°F (0.3°C to 0.6°C) lower than a rectal temperature.

Before putting the thermometer away, clean it with soap and warm water or alcohol.

When reporting the temperature to your baby's healthcare provider, make sure you tell him or her that it was an axillary temperature reading.